CN110289121A - A kind of alloy aluminium paste for PERC rear surface of solar cell - Google Patents

A kind of alloy aluminium paste for PERC rear surface of solar cell Download PDF

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Publication number
CN110289121A
CN110289121A CN201910529096.3A CN201910529096A CN110289121A CN 110289121 A CN110289121 A CN 110289121A CN 201910529096 A CN201910529096 A CN 201910529096A CN 110289121 A CN110289121 A CN 110289121A
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China
Prior art keywords
alloy
glass powder
perc
solar cell
rear surface
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CN201910529096.3A
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CN110289121B (en
Inventor
朱鹏
杨贵忠
陈鑫剑
徐海波
王叶青
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Nantong Tiansheng New Energy Co Ltd
Nantong T Sun New Energy Co Ltd
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Nantong Tiansheng New Energy Co Ltd
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Priority to CN201910529096.3A priority Critical patent/CN110289121B/en
Priority to US17/431,372 priority patent/US11833584B2/en
Priority to PCT/CN2019/095753 priority patent/WO2020252828A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/107Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/04Making non-ferrous alloys by powder metallurgy
    • C22C1/05Mixtures of metal powder with non-metallic powder
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20Conductive material dispersed in non-conductive organic material
    • H01B1/22Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0216Coatings
    • H01L31/02161Coatings for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/02167Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0224Electrodes
    • H01L31/022408Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/05Metallic powder characterised by the size or surface area of the particles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2301/00Metallic composition of the powder or its coating
    • B22F2301/05Light metals
    • B22F2301/052Aluminium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2304/00Physical aspects of the powder
    • B22F2304/10Micron size particles, i.e. above 1 micrometer up to 500 micrometer
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The invention discloses a kind of alloy aluminium pastes for PERC rear surface of solar cell, with the weight of the alloy aluminium paste for 100%, the alloy silver paste includes that following components is prepared according to weight percent: 35~56.5% alusil alloy powder, 17.5~37.5% aluminium powder, 1~2% lead-free glass powder, 15~20% organic solvent, 3~5% ethyl cellulose, 0.05~0.1% thixotropic agent and 0.5~1.5% dispersing agent, and the alloy pulp is applied to 0.5~1% PERC solar battery that passivating film total open area accounts for solar-electricity pool area, the alloy aluminium paste is used for low aperture opening ratio PERC solar battery, especially passivating film total open area 0.5~1% rear electrode that accounts for solar-electricity pool area , pore filling ratios are good, and the BSF layer formed is complete and uniform, and aluminium pill is reduced, and boiling performance is preferable with adhesion.

Description

A kind of alloy aluminium paste for PERC rear surface of solar cell
Technical field
The present invention relates to a kind of rear surface of solar cell aluminium pastes, and in particular to a kind of for PERC rear surface of solar cell Alloy aluminium paste.
Background technique
PERC technology, i.e. passivation emitter rear-face contact promote conversion by forming passivation layer in rear surface of solar cell Efficiency.PERC battery has simple process, and cost is relatively low, and the advantage high with existing production line for manufacturing battery compatibility, is expected to become The main flow direction of the following high performance solar batteries.
PERC technology improves transformation efficiency by adding a dielectric passivation layer on the back side of battery.Normal cell Higher level of efficiency is limited to the trend of light induced electron recombination in structure.PERC battery maximizes the potential for spanning P-N junction Gradient, this flowing for making electronics more stable reduce electron recombination and higher level of efficiency.
The characteristics of PERC battery is: (1) tow sides of battery all deposit passivating film;(2) aluminium paste of back surface field directly covers Overleaf localized contact is formed with silicon substrate on passivating film.According to the design feature of PERC battery, battery need passivation on double surfaces and Rear side local contact improves cell conversion efficiency so that surface recombination be greatly lowered.Passivation on double surfaces then requires battery two sides all Deielectric-coating need to be plated, rear side local contact then needs the back side to open film, therefore the process flow of PERC battery are as follows: (1) alkali making herbs into wool;(2) POCl2Diffusion;(3) wet process back-etching;(4) passivation on double surfaces film;(5) back side dielectric film aperture;(6) it metallizes.Wherein, The chemical industry of PERC battery metal still can use silk-screen printing technique, but since the back side of PERC battery is to the property of electrocondution slurry The requirement different from conventional batteries slurry can be proposed.
The overleaf localized metallic stage can encounter Al-BSF cavity problem, the i.e. not formed aluminium in partial metallic contact region Back surface field, silicon dissolve into aluminium and form cavity, will cause the raising of contact resistance and the decline of fill factor.PERC battery is to the back side Aluminium paste basic demand is as follows: (1) it is good to open filling effect at film;(2) low to the damage of deielectric-coating;(3) it is formed continuous, uniform , the suitably local Al-BSF (LBSF) of thickness;(4) have good reliability, such as adhesion, ageing-resistant performance.With The fast development of PERC battery, demand of the market to PERC battery special-purpose metal electrocondution slurry are more more and more intense.
Taiwan Patent TW201827530A provides a kind of solar cell paste constituent, and the present invention provides a kind of cream Shape constituent includes glass powder, organic carrier and conductive material specifically, solar cell paste constituent, It is characterized in, (1) described conductive material, Al-X alloy powder 40 mass % or more of the fusing point between 660~800 DEG C;(2) institute The element X for the Al-X alloy powder stated is at least one in silicon, barium, bismuth, calcium, germanium, indium, lanthanum, nickel, lead, antimony, strontium, tellurium and yttrium Kind, the alloy pulp being prepared using the technology accounts for the 0.5~1% of solar-electricity pool area in passivating film total open area Pore filling ratios in PERC solar battery are not high, and the BSF layer formed is irregular.
Summary of the invention
Goal of the invention: to solve the above-mentioned problems, that the present invention provides a kind of hole filling rates is high, can formation rule The low alloy aluminium paste for PERC rear surface of solar cell of the corrosivity of BSF layers and slurry, specific technical solution are as follows:
Technical solution: the object of the present invention is to provide a kind of alloy aluminium paste for PERC rear surface of solar cell, skills Art point is: with the weight of the alloy aluminium paste for 100%, the alloy aluminium paste includes following components system according to weight percent It is standby to form:
The weight ratio of the alusil alloy powder and aluminium powder is 1~3:1, the median particle diameter D of the alusil alloy50For 5~6 μ M, the content of oxygen is 0.3~0.4wt%, the median particle diameter D of the aluminium powder in the alusil alloy50It is 7~8 μm, the aluminium powder The content of middle oxygen is 0.35~0.45wt%.
In an embodiment of the present invention, the lead-free glass powder is mixed with to obtain by glass powder A and glass powder B, with institute The weight for stating lead-free glass powder is 100%, and the weight of the glass powder A is 60~90%, the weight of the glass powder B is 10~ 40%, the median particle diameter D of the glass powder A50It is 1~3 μm, the softening temperature of the glass powder A is 500~600 DEG C, the glass The median particle diameter D of glass powder B50It is 1.3~1.8 μm, the softening temperature of the glass powder B is 400~450 DEG C.
In an embodiment of the present invention, with the weight of the glass powder A for 100%, the glass powder A is according to weight percent Than by 0~40% ZnO, 1~40% B2O3, 30~40% Sb2O3With 0~70% MxNyIt is prepared, wherein element M For alkali metal, perhaps alkaline-earth metal N is O element or CO3Perhaps at least one of halogen x be 1 or 2, y be 1 or Person 2.
In an embodiment of the present invention, it is best that the element M, which is at least one of Ba, Ca, Sr, Na, K, Rb and Cs,.
In an embodiment of the present invention, with the weight of the glass powder B for 100%, the glass powder B is according to weight percent Than the V by 10~50%2O5, 0~30% ZnO, 5~40%B2O3, 0~20% P2O5Or P2(CO3)5, 0~20% WO3Or MoO3, 10~40% RQzIt is prepared, wherein element R is alkaline-earth metal, and Q is O element or CO3Or halogen family At least one of element, z are 1 or 2.
In an embodiment of the present invention, it is best that the element R, which is selected from least one of Ba, Ca and Sr,.
In an embodiment of the present invention, the boiling point of the organic solvent is 170~250 DEG C.
In an embodiment of the present invention, the organic solvent is selected from butyl carbitol, butyl carbitol acetate, alcohol ester ten Two, one of butyl glycol ether, terpinol and turpentine oil or several.
In an embodiment of the present invention, the dispersing agent is selected from TDO, sorbitan trioleate, BYK-110 and BYK- One of 111 or several mixing.
Wherein, TDO is a kind of special superpower wetting dispersing agent of double ion long-chain, is suitble to prepare various aqueous and oiliness Organic and inorganic painting slurry has high surface, therefore has outstanding performance, migrates coating during film curing, It is firmly adsorbed on the surface of solids, to reach ideal effect.
BYK-110 makes coating solution flocculate by steric hindrance.Due to solving flocculated coating particles very little, to can get height Gloss promotes color intensity.In addition, increasing transparency and covering power.These products reduce viscosity, thus improve levelling Property, and the content of coating can be improved.
BYK-111 is not solvent-laden wetting dispersing agent, for solvent type and solventless coatings and printing ink, Ke Yiwen Determine inorganic pigment, especially titanium dioxide.It is substantially reduced mill base viscosity.
In above-mentioned all embodiments, the alloy aluminium paste is applied to passivating film total open area and accounts for solar battery The PERC solar battery of the 0.5~1% of area.
The utility model has the advantages that specific advantage of the invention is as follows:
(1) in a kind of formula for the alloy aluminium paste of PERC rear surface of solar cell of the invention there are also 35~ The alusil alloy of 56.5wt%, the median particle diameter D of the alusil alloy50It is 5~6 μm, the content of oxygen is 0.3 in the alusil alloy ~0.4wt%, the median particle diameter D of the aluminium powder50It is 7~8 μm, the content of oxygen is 0.35~0.45wt% in the aluminium powder, should The activity of alloy pulp can be improved in alusil alloy, to improve the pore filling ratios of alloy pulp.
(2) a kind of formula of alloy aluminium paste for PERC rear surface of solar cell of the invention is reasonable, opens suitable for low Mouth rate PERC solar battery, especially passivating film total open area account for 0.5~1% back side electricity of solar-electricity pool area The pore filling ratios of pole, alloy aluminium paste printing of the invention are good, and the BSF layer formed is complete and uniform, and aluminium pill is reduced, boiling It can be preferable with adhesion.
(3) using organic solvent in a kind of formula for the alloy aluminium paste of PERC rear surface of solar cell of the invention Boiling point is 170~250 DEG C, and butyl carbitol, butyl carbitol acetate, alcohol ester 12, butyl glycol ether, terpinol and pine The wellability and volatility of fuel-economizing are relatively good, reduce destruction of the organic carrier to silicon substrate in sintering process.
(4) two kinds of glass powders are used in a kind of formula for the alloy aluminium paste of PERC rear surface of solar cell of the invention Mixing, two kinds of glass powders of the invention are free of Pb, comply fully with the requirement of environmental protection, the present invention is using the glass powder compounded, originally The glass powder of invention is that alkalescent can effectively reduce glass powder to the corrosivity of silicon substrate.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, so that the technology of this field Personnel can better understand advantages and features of the invention, to make apparent boundary to protection scope of the present invention It is fixed.Embodiment described in the invention is only a part of the embodiment of the present invention, instead of all the embodiments, based on the present invention In embodiment, those of ordinary skill in the art's every other implementation obtained without making creative work Example, shall fall within the protection scope of the present invention.
Embodiment 1
1. the preparation of lead-free glass powder
The preparation of glass powder A: with the weight of glass powder A for 100%, prepare 20% ZnO, 20% B2O3, 35% Sb2O3, 5% BaCl2, 10%Na2CO3With 10% Rb2O2, the present embodiment is using BaCl2The metal of other halogens Compound is equally applicable by adjusting adding proportion, then says each object using mixing machine known to dispersion machine or three-roller etc. Material is uniformly mixed, and 3.5h is then dried, then goes to the raw material of drying process in crucible, then will be loaded with raw material Crucible be placed into heating chamber and be first warming up to 950 DEG C, then keep the temperature 1.5h, the feed liquid for then completing melting is through cooling Roller obtains frit, is then crushed frit, sieves to obtain median particle diameter D50It is 1.36 μm, softening temperature 544.7 DEG C glass powder A.
The preparation of frit B: with the weight of glass powder B for 100%, prepare 30% V2O5, 15% ZnO, 22% B2O3, 10% P2O5, 10% WO3, 5% BaCO3CaO with 8%, is then mixed using known to dispersion machine or three-roller etc. Conjunction machine says that each material is uniformly mixed, and 3h is then dried, then goes to the raw material of drying process in crucible, then will The crucible for being loaded with raw material, which is placed into heating chamber, is first warming up to 1000 DEG C, then keeps the temperature 1h, the material for then completing melting Liquid obtains frit through chill roll, is then crushed frit, sieves to obtain median particle diameter D50It is 1.33 μm, softening temperature The glass powder B that degree is 405 DEG C.
2. the preparation of alloy pulp
With the weight of alloy aluminium paste for 100%, alloy silver paste of the invention includes following components system according to weight percent It is standby to form:
Wherein, the median particle diameter D of alusil alloy50It is 5.5 μm, the content of oxygen is 0.35wt% in alusil alloy, aluminium powder Median particle diameter D50It is 7.5 μm, the content of oxygen is 0.4wt% in aluminium powder, and the boiling point of organic solvent butyl glycol ether is 227 DEG C, will Above-mentioned ready material is proportionally mixed, then carries out grinding distribution, so that the fineness for the slurry being prepared must not More than 15 μm.
Embodiment 2
1. the preparation of lead-free glass powder
The preparation of glass powder A: with the weight of glass powder A for 100%, prepare 40% ZnO, 5% B2O3, 30% Sb2O3, 5% SrCl, 10%Cs2CO3With 10% BaO, the present embodiment using other halogens of SrCl metallization It closes object and is equally applicable by adjusting adding proportion, then say each material using mixing machine known to dispersion machine or three-roller etc. It is uniformly mixed, 3h is then dried, then goes to the raw material of drying process in crucible, then the earthenware that raw material will be loaded with Crucible, which is placed into heating chamber, is first warming up to 850 DEG C, then keeps the temperature 2h, and the feed liquid for then completing melting is obtained through chill roll Then frit is crushed, sieves to obtain median particle diameter D by frit50It is 1.89 μm, the glass that softening temperature is 570 DEG C Powder A.
The preparation of frit B: with the weight of glass powder B for 100%, prepare 50% V2O5, 5% ZnO, 5%B2O3、 5% P2(CO3)5, 5% WO3, 15% Sr2CO3With 15% CaI2, the present embodiment is using CaI2Other halogens Metallic compound by adjust adding proportion be equally applicable, then said using mixing machine known to dispersion machine or three-roller etc. Each material is uniformly mixed, and 3h is then dried, then goes to the raw material of drying process in crucible, then will be loaded with The crucible of raw material, which is placed into heating chamber, is first warming up to 1000 DEG C, then keeps the temperature 1h, and the feed liquid for then completing melting is through cold But roller obtains frit, is then crushed frit, sieves to obtain median particle diameter D50It is 1.64 μm, softening temperature 426 DEG C glass powder B.
2. the preparation of alloy pulp
With the weight of alloy aluminium paste for 100%, alloy silver paste of the invention includes following components system according to weight percent It is standby to form:
Wherein, the median particle diameter D of alusil alloy50It is 6 μm, the content of oxygen is 0.4wt%, the intermediate value of aluminium powder in alusil alloy Partial size D50It is 8 μm, the content of oxygen is 0.3wt% in aluminium powder, and the boiling point of organic solvent butyl carbitol and alcohol ester 12 is 231 DEG C With 255 DEG C, above-mentioned ready material is proportionally mixed, then carry out grinding distribution, so that the slurry being prepared Fineness must not exceed 15 μm.
Embodiment 3
1. the preparation of lead-free glass powder
The preparation of glass powder A: with the weight of glass powder A for 100%, prepare 10% ZnO, 30% B2O3, 30% Sb2O3, 10% CaCl2, 10%K2CO3With 10% Cs2O, the present embodiment is using CaCl2The metal of other halogens Compound is equally applicable by adjusting adding proportion, then says each object using mixing machine known to dispersion machine or three-roller etc. Material is uniformly mixed, and 4h is then dried, then goes to the raw material of drying process in crucible, then will be loaded with raw material Crucible, which is placed into heating chamber, is first warming up to 1050 DEG C, then keeps the temperature 2h, and the feed liquid for then completing melting is obtained through chill roll To frit, then frit is crushed, sieves to obtain median particle diameter D50It is 2.17 μm, softening temperature is 530.6 DEG C Glass powder A.
The preparation of frit B: with the weight of glass powder B for 100%, prepare 10% V2O5, 40% ZnO, 20% B2O3, 5% P2(CO3)5, 10% MoO3, 5% CaCO3With 10% Sr2O, then using dispersion machine or three-roller etc. The mixing machine known says that each material is uniformly mixed, and 3h is then dried, the raw material of drying process is then gone to crucible It is interior, then the crucible for being loaded with raw material is placed into heating chamber and is first warming up to 1000 DEG C, 1h is then kept the temperature, it is then that melting is complete At feed liquid through chill roll, obtain frit, then frit be crushed, sieves to obtain median particle diameter D50It is 1.45 μm, The glass powder B that softening temperature is 435 DEG C.
2. the preparation of alloy pulp
With the weight of alloy aluminium paste for 100%, alloy silver paste of the invention includes following components system according to weight percent It is standby to form:
Wherein, the median particle diameter D of alusil alloy50It is 5 μm, the content of oxygen is 0.3wt%, the intermediate value of aluminium powder in alusil alloy Partial size D50It is 7 μm, the content of oxygen is 0.35wt% in aluminium powder, and organic solvent butyl glycol ether and terebinthine boiling point are respectively 227 DEG C and 173~175 DEG C, above-mentioned ready material is proportionally mixed, then carry out grinding distribution, so that preparation The fineness of obtained slurry must not exceed 15 μm.
Comparative example 1
1. the preparation of glass powder
15 parts of B is weighed by mass parts2O3, 3 parts of SiO2, 15 parts of Bi2O3, 60 parts of PbO and 7 part of ZnO, use mixing Machine be uniformly mixed, be packed into porcelain crucible, be put into Muffle furnace, in 900 DEG C, keep the temperature 1h, by the glass powder particle use after fusing from After sub- water quenching, ball milling 2.5h is obtained through 200 meshes to partial size D90Glass powder less than 2 μm.
2. preparing cell back surface field aluminium paste
Aluminium is commercially available purity 99.9%, 1.0~2.5 μm of average grain diameter of aluminium powder, weighs 75 parts of aluminium powder by mass parts, glass 7 parts of powder, 15 parts of organic binder, 3 parts of auxiliary agent, remaining operates same embodiment.
Comparative example 2
1. the preparation of glass powder
17 parts of B is weighed by mass parts2O3, 1 part of SiO2, 13 parts of Bi2O3, 65 parts of PbO and 4 part of ZnO, use mixing Machine be uniformly mixed, be packed into porcelain crucible, be put into Muffle furnace, in 900 DEG C, keep the temperature 1h, by the glass powder particle use after fusing from After sub- water quenching, ball milling 2.5h is obtained through 200 meshes to partial size D90Glass powder less than 2 μm.
2. preparing cell back surface field aluminium paste
Aluminium powder is commercially available purity 99.9%, 1.0~2.5 μm of average grain diameter of aluminium powder, weighs 70 parts of aluminium powder by mass parts, glass 10 parts of glass powder, 17 parts of organic binder, 3 parts of auxiliary agent, remaining operates same embodiment.
Performance detection of the invention is analyzed as follows:
Then it is passed through 250 being screen printed onto of mesh by the electrocondution slurry of the preparation of Example 1~3 and comparative example 1,2 Film total open area accounts for the 0.5~1% of solar-electricity pool area, the monocrystalline silicon piece of the PERC battery of specification 125mm × 125mm Electrode film is formed on back passive surface, is dried into 220 DEG C of Muffle furnace.After drying then aluminium electrode film layer changes another side without falling off Front side silver paste is printed, is sintered into Muffle furnace, 780 DEG C of peak temperature, it is as shown in table 1 that its electrical data is tested after sintering.
1 electrical data table of table
As shown above, the incident photon-to-electron conversion efficiency of the alloy pulp for the PERC solar cell being prepared using the present invention For 22.26-22.42%, relative to comparative example, photoelectric conversion efficiency is obviously increased, and the present invention is suitable for low aperture opening ratio PERC Solar battery, especially passivating film total open area account for 0.5~1% rear electrode of solar-electricity pool area, gap Filling rate is good, and the BSF layer formed is complete and uniform, and aluminium pill is reduced, and boiling performance is preferable with adhesion.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected The limitation of range is protected, although explaining in detail referring to preferred embodiment to the present invention, those skilled in the art are answered Work as understanding, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the reality of technical solution of the present invention Matter and range.

Claims (10)

1. a kind of alloy aluminium paste for PERC rear surface of solar cell, it is characterised in that: with the weight of the alloy aluminium paste It is 100%, the alloy silver paste includes that following components is prepared according to weight percent:
The weight ratio of the alusil alloy powder and aluminium powder is 1~3:1, the median particle diameter D of the alusil alloy50For 5~6 μ M, the content of oxygen is 0.3~0.4wt%, the median particle diameter D of the aluminium powder in the alusil alloy50It is 7~8 μm, it is described Aluminium powder in oxygen content be 0.35~0.45wt%.
2. the alloy aluminium paste according to claim 1 for PERC rear surface of solar cell, it is characterised in that: the nothing Lead glass powder is mixed with to obtain by glass powder A and glass powder B, with the weight of the lead-free glass powder for 100%, the glass The weight of glass powder A is 60~90%, and the weight of the glass powder B is 10~40%, the median particle diameter D of the glass powder A50It is 1 ~3 μm, the softening temperature of the glass powder A is 500~600 DEG C, the median particle diameter D of the glass powder B50It is 1.3~1.8 μm, The softening temperature of the glass powder B is 400~450 DEG C.
3. the alloy aluminium paste according to claim 2 for PERC rear surface of solar cell, it is characterised in that: with described The weight of glass powder A is 100%, and the glass powder A is according to weight percent by 0~40% ZnO, 1~40% B2O3、 30~40% Sb2O3With 0~70% MxNyIt is prepared, wherein element M is alkali metal or alkaline-earth metal, and N is O element Or CO3Perhaps at least one of halogen x be 1 perhaps 2 y be 1 or 2.
4. the alloy aluminium paste according to claim 3 for PERC rear surface of solar cell, it is characterised in that: the member Plain M is at least one of Ba, Ca, Sr, Na, K, Rb and Cs.
5. the alloy aluminium paste according to claim 2 for PERC rear surface of solar cell, it is characterised in that: with described The weight of glass powder B be 100%, the glass powder B according to weight percent by 10~50% V2O5, 0~30% ZnO, 5~40%B2O3, 0~20% P2O5Or P2(CO3)5, 0~20% WO3Or MoO3, 10~40% RQzPreparation and At wherein element R is alkaline-earth metal, and Q is O element or CO3Perhaps at least one of halogen z is 1 or 2.
6. the alloy aluminium paste according to claim 5 for PERC rear surface of solar cell, it is characterised in that: the member Plain R is selected from least one of Ba, Ca and Sr.
7. the alloy aluminium paste according to claim 1 for PERC rear surface of solar cell, it is characterised in that: described has The boiling point of solvent is 170~250 DEG C.
8. the alloy aluminium paste according to claim 1 for PERC rear surface of solar cell, it is characterised in that: described has Solvent is in butyl carbitol, butyl carbitol acetate, alcohol ester 12, butyl glycol ether, terpinol and turpentine oil It is one or several kinds of.
9. the alloy aluminium paste according to claim 1 for PERC rear surface of solar cell, it is characterised in that: point Powder is selected from one of TDO, sorbitan trioleate, BYK-110 and BYK-111 or several mixing.
10. answering for the alloy aluminium paste of PERC rear surface of solar cell described in a kind of any one according to claim 1~9 With, it is characterised in that: the alloy aluminium paste is applied to passivating film total open area and accounts for the 0.5~1% of solar-electricity pool area PERC solar battery.
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